<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_InfoCard
 * @subpackage Zend_InfoCard_Cipher
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Exception.php 2794 2007-01-16 01:29:51Z bkarwin $
 * @author     John Coggeshall <john@zend.com>
 */

/**
 * Zend_InfoCard_Cipher_Exception
 */
require_once 'Zend/InfoCard/Cipher/Exception.php';

/**
 * Provides an abstraction for encryption ciphers used in an Information Card 
 * implementation
 * 
 * @category   Zend
 * @package    Zend_InfoCard
 * @subpackage Zend_InfoCard_Cipher
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @author     John Coggeshall <john@zend.com>
 */
class Zend_InfoCard_Cipher 
{
	/**
	 * AES 256 Encryption with CBC
	 */
	const ENC_AES256CBC      = 'http://www.w3.org/2001/04/xmlenc#aes256-cbc';
	
	/**
	 * AES 128 Encryption with CBC
	 */
	const ENC_AES128CBC      = 'http://www.w3.org/2001/04/xmlenc#aes128-cbc';
	
	/**
	 * RSA Public Key Encryption with OAEP Padding
	 */
	const ENC_RSA_OAEP_MGF1P = 'http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p';
	
	/**
	 * RSA Public Key Encryption with no padding
	 */
	const ENC_RSA            = 'http://www.w3.org/2001/04/xmlenc#rsa-1_5';

    /**
     * Constructor (disabled)
     * 
     * @return void
     * @codeCoverageIgnoreStart
     */
    private function __construct() 
    { 
    }
    // @codeCoverageIgnoreEnd
	/**
	 * Returns an instance of a cipher object supported based on the URI provided
	 *
	 * @throws Zend_InfoCard_Cipher_Exception
	 * @param string $uri The URI of the encryption method wantde
	 * @return mixed an Instance of Zend_InfoCard_Cipher_Symmetric_Interface or Zend_InfoCard_Cipher_PKI_Interface
	 *               depending on URI
	 */
    static public function getInstanceByURI($uri) 
    {
		switch($uri) {
			case self::ENC_AES256CBC:
				include_once 'Zend/InfoCard/Cipher/Symmetric/Adapter/AES256CBC.php';
				return new Zend_InfoCard_Cipher_Symmetric_Adapter_AES256CBC();

			case self::ENC_AES128CBC:
				include_once 'Zend/InfoCard/Cipher/Symmetric/Adapter/AES128CBC.php';
				return new Zend_InfoCard_Cipher_Symmetric_Adapter_AES128CBC();
			
			case self::ENC_RSA_OAEP_MGF1P:
				include_once 'Zend/InfoCard/Cipher/PKI/Adapter/RSA.php';
				return new Zend_InfoCard_Cipher_PKI_Adapter_RSA(Zend_InfoCard_Cipher_PKI_Adapter_RSA::OAEP_PADDING);
				break;

			case self::ENC_RSA:
				include_once 'Zend/InfoCard/Cipher/PKI/Adapter/RSA.php';
				return new Zend_InfoCard_Cipher_PKI_Adapter_RSA(Zend_InfoCard_Cipher_PKI_Adapter_RSA::NO_PADDING);
				break;
			
			default:
				throw new Zend_InfoCard_Cipher_Exception("Unknown Cipher URI");
		}
	}
}
